Stewartville, MN 55976 Frost Dates
55976, near Stewartville, MN: the frost window
Around 04/30 is the usual last spring frost, about 245 days away. Fall's first freeze usually shows up around 10/06, roughly 159 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Stewartville in Zone 4b (-25 to -20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Stewartville's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Stewartville against the rest of the dataset
Stewartville's growing season runs about 159 days, ranking 32,634 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 251 of 943.
Learn more
Two guides worth reading on 55976: the frost range, on how to read the range around Stewartville's dates instead of trusting one, and local microclimates, on what one yard in Stewartville can differ from the 55976 normal.